Versions Compared

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

You can make various viewpoints of the full system strip charts using this page: https://e906-gat1.fnal.gov/data-summary/e1039
The Target TV page 'https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/target-tv.php' gives you an overall idea about the full system (but not all the parameters).

...


1. LCW

Two target sub-systems use LCW (Low Conductivity Water) for cooling.
1. Helium Liquefier System (UVA-QT): see QT System Manual for more details.
2. Roots pump-system: see Pumps System Manual for more details.

...

ImageImage
                                          Note: The 2nd flow meter from the right is from the rotary vane pump and it usually takes about 5-10mins to show a flow after it is started.

You can monitor these outlet flow from the strip charts remotely, and a sample screenshot is shown below.

2. Insulation Vacuum Chamber (IVC)

This is the vacuum space of the superconducting magnet. When the system is running/operational, the IVC should be below 9 x 10E-6 Torr.
If this values goes above 1 x 10E-5 Torr, then IMMEDIATELY contact the Target Expert to fix it.
Note: during magnet LHe fills, LN2 fills, and fridge fills this IVC can fluctuate but it should go back to below 9 x 10E-6 Torr soon.

...

The top-left plot shows the IVC https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/target-tv.php

3. UVA-QT System

The most important things to frequently check:
1) LCW supply (see the section 1 above).
2) LCW outlet temperatures from the coldheads (see the section 1 above).
3) HR3 status (should be always running in the LOAD mode): see  HR3 Manual for more details.
    You can check its status by plotting "HR3 Enabled" from the strip-charts https://e906-gat1.fnal.gov/data-summary/e1039/target-all-auto.php,
     and it should be the value "-1" when it is running, and "0" when it is off.
     Image Added

On the strip charts,
1) Ensure both Liquefiers are producing LHe. Check the top-right plot in the https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/target-tv.php.
2) Ensure the purifier has LN2 level above 75%. Check the top-middle plot in the https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/target-tv.php.
    If the level is below 75%, then perform a refill using the procedure: docdb 10337
3) Check the difference between the parameters "Outside gHe tank(psig)" and "PT501 (A or B or both)" using https://e906-gat1.fnal.gov/data-summary/e1039/target-all-auto.php
   Image Added
    If the difference is above 40 psig, then that indicates that the purifier needs cleaning / regeneration.
    Follow Cleaning QT purifier Helium-space (pumping-purging the purifier) procedure with the Target Expert.
    



Roots pumps setup



Outside gaseous helium tank

...